US6461508B1ExpiredUtility

Apparatus for separating dirt or dust from an airflow

67
Assignee: NOTETRY LTDPriority: Jul 20, 1998Filed: Jul 16, 1999Granted: Oct 8, 2002
Est. expiryJul 20, 2018(expired)· nominal 20-yr term from priority
Inventors:Andrew Walter Mcrae Thomson
Y10S55/03A47L 9/1683B04C 5/26B04C 5/08A47L 9/1633B01D 45/08B04C 5/103
67
PatentIndex Score
35
Cited by
4
References
30
Claims

Abstract

The invention provides apparatus for separating dirt or dust from an airflow, comprising a collector ( 32 ) having an outer wall ( 32 a ) forming an air-rotational surface, an inner wall ( 34 a ), an airflow inlet for introducing the airflow substantially tangentially to the outer wall ( 32 a ), an airflow outlet for removing air from the collector ( 32 ), and at least one fin or baffle ( 30 ) positioned within the collector ( 32 ), characterized in that the or each fin or baffle ( 30 ) is located on the inner wall ( 34 a ) of the collector ( 32 ) and projects outwardly therefrom. The presence of the fins or baffles ( 30 ) on the inner wall ( 34 a ) discourages re-entrainment of dirt and dust particles remaining within the separation apparatus after the airflow therethrough has been discontinued.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
       1. A cyclonic separator for separating dirt or dust from an airflow, comprising: 
       an outer wall, an inner wall, a collecting area located between the outer wall and the inner wall for collecting dirt or dust separated from the airflow, an airflow inlet for introducing the airflow substantially tangentially to the outer wall, an airflow outlet for removing air from the separator, the airflow inlet and the airflow outlet being spaced apart from the collecting area, and at least one first fin or baffle positioned within the separator,  
       wherein each first fin or baffle is located at least partly in the collecting area on the inner wall and projects outwardly from the inner wall.  
     
     
       2. A cyclonic separator as claimed in  claim 1 , comprising a plurality of first fins or baffles. 
     
     
       3. A cyclonic separator as claimed in  claim 2 , comprising between two and six first fins or baffles. 
     
     
       4. A cyclonic separator as claimed in  claim 3 , comprising four first fins or baffles. 
     
     
       5. A cyclonic separator as claimed in  claim 1 ,  2 ,  3  or  4 , wherein each first fin or baffle extends radially outwardly from the inner wall. 
     
     
       6. A cyclonic separator as claimed in  claim 5 , wherein each fin or baffle has an upper edge which is inclined to a longitudinal axis of the separator. 
     
     
       7. A cyclonic separator as claimed in  claim 5 , wherein each fin or baffle extends between one quarter and three quarters of a distance between the inner wall and the outer wall. 
     
     
       8. A cyclonic separator as claimed in  claim 5 , wherein the outer wall is substantially cylindrical. 
     
     
       9. A cyclonic separator as claimed in  claim 5 , wherein the inner wall is substantially cylindrical. 
     
     
       10. A cyclonic separator as claimed in  claim 1 ,  2 ,  3  or  4 , wherein each first fin or baffle has an upper edge which is inclined to a longitudinal axis of the separator. 
     
     
       11. A cyclonic separator as claimed in  claim 10 , wherein the angle of inclination of the upper edge to the longitudinal axis is between 30° and 60°. 
     
     
       12. A cyclonic separator as claimed in  claim 11 , wherein the angle of inclination of the upper edge to the longitudinal axis is between 45° and 50°. 
     
     
       13. A cyclonic separator as claimed in  claim 10 , wherein each fin or baffle extends between one quarter and three quarters of a distance between the inner wall and the outer wall. 
     
     
       14. A cyclonic separator as claimed in  claim 10 , wherein the outer wall is substantially cylindrical. 
     
     
       15. A cyclonic separator as claimed in  claim 10 , wherein the inner wall is substantially cylindrical. 
     
     
       16. A cyclonic separator as claimed in  claim 1 ,  2 ,  3  or  4 , wherein each first fin or baffle extends one quarter and three quarters of a distance between the inner wall and the outer wall. 
     
     
       17. A cyclonic separator as claimed in  claim 16 , wherein each first fin or baffle extends substantially half of the distance between the inner wall and the outer wall. 
     
     
       18. A cyclonic separator as claimed in  claim 16 , wherein the outer wall is substantially cylindrical. 
     
     
       19. A cyclonic separator as claimed in  claim 16 , wherein the inner wall is substantially cylindrical. 
     
     
       20. A cyclonic separator as claimed in  claim 1 , wherein the outer wall is substantially cylindrical. 
     
     
       21. A cyclonic separator as claimed in  claim 1 , wherein the inner wall is substantially cylindrical. 
     
     
       22. A cyclonic separator as claimed in  claim 21 , further comprising a second cyclonic separator, of which the inner wall forms a part. 
     
     
       23. A cyclonic separator as claimed in  claim 22 , wherein the second cyclonic separator has a higher efficiency of separation than the first cyclonic separator. 
     
     
       24. A cyclonic separator as claimed in  claim 23 , wherein the second cyclonic separator is located substantially wholly within the first cyclonic separator. 
     
     
       25. A cyclonic separator as claimed in  claim 22 , wherein the second cyclonic separator is located substantially wholly within the first cyclonic separator. 
     
     
       26. A cyclonic separator as claimed in  claim 1 , further comprising additional fins or baffles provided on the outer wall radially outwardly of the first fins or baffles. 
     
     
       27. A cyclonic separator as claimed in  claim 26 , wherein the additional fins or baffles have substantially the same shape as the first fins or baffles. 
     
     
       28. A cyclonic separator as claimed in  claim 26 , wherein the distance between pairs of the first and additional fins or baffles is between one eighth and one half of the distance between the inner and outer walls. 
     
     
       29. A cyclonic separator as claimed in  claim 28 , wherein the distance between pairs of the first and additional fins or baffles is substantially one quarter of the distance between the inner and outer walls. 
     
     
       30. A cyclonic separator as claimed in  claim 1 , wherein the outer wall forms an air-rotational surface.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.